Bottle cap assembly for a bird feeder



FIG. 1 is a side view of a bottle cap assembly for a bird feeder;

FIG. 2 is a top view of the bottle cap assembly for the bird feeder;

FIG. 3 is a bottom view of the bottle cap assembly for the bird feeder; and,

FIG. 4 is a perspective side view of the bottle cap assembly for the bird feeder. 

I claim the ornamental design for a bottle cap assembly for a bird feeder, as shown. 